docs: Verify/review config descriptions

[maria-robobug]

• Reviewed and modified descriptions.
• Added some minor formatting.
• Removed the "Key:" before every key name, seems redundant.

[kuznetsss]

@PeterChen13579, could you please bring these changes into code without updating the md file?

[kuznetsss]

@maria-robobug, could you please add a link to this file somewhere in docs?

[maria-robobug]

@maria-robobug, could you please add a link to this file somewhere in docs?

@kuznetsss good point. I could reference it from the page below:
https://github.com/XRPLF/clio/blob/develop/docs/configure-clio.md

I'll update the PR shortly...

[codecov]

Codecov Report

Attention: Patch coverage is 62.92994% with 291 lines in your changes missing coverage. Please review.

Project coverage is 72.67%. Comparing base (427ba47) to head (945842f).
Report is 50 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/etlng/ETLService.hpp	0.00%	84 Missing ⚠️
src/etlng/LoadBalancer.cpp	75.00%	24 Missing and 20 partials ⚠️
src/data/LedgerCache.cpp	0.00%	35 Missing ⚠️
src/etlng/Source.cpp	0.00%	16 Missing ⚠️
src/etlng/impl/SourceImpl.hpp	62.79%	4 Missing and 12 partials ⚠️
src/etl/ETLService.hpp	0.00%	14 Missing ⚠️
src/cluster/ClusterCommunicationService.cpp	86.90%	7 Missing and 4 partials ⚠️
src/app/ClioApplication.cpp	0.00%	9 Missing ⚠️
src/etlng/impl/ForwardingSource.cpp	79.54%	2 Missing and 7 partials ⚠️
src/web/ng/impl/HttpConnection.hpp	35.71%	8 Missing and 1 partial ⚠️
... and 14 more

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1960      +/-   ##
===========================================
- Coverage    72.71%   72.67%   -0.04%     
===========================================
  Files          333      354      +21     
  Lines        13525    14571    +1046     
  Branches      6881     7409     +528     
===========================================
+ Hits          9835    10590     +755     
- Misses        1785     1967     +182     
- Partials      1905     2014     +109     

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[PeterChen13579]

Thanks for the review! 😃 Just one question